Re: [Freeipmi-devel] Recreating SDR cache before reading sensors information

[Kaiwang Chen]

2012/2/24 Dinh Khac Thanh <address@hidden>:
> Hi,
>
> I am working on a monitoring application that needs to get sensor
> information via IPMI every 10 seconds. I have skimmed through the source
> code for ipmi-sensors to learn how to use freeipmi.
>
> My question is: If I am using the same IPMI session to get sensor data, do I
> need to recreate the SDR cache every time before reading the data?

I believe not. The cache is checked before real ipmi traffic, and it's
a noop when the cache exists and is up to date. There is one sdr cache
per ipmi node, which defaults  to
~/.freeipmi/sdr-cache/sdr-cache-<localhost>.<ipminode>

The logic resides in common code path defined in
common/toolsdr/tool-sdr-cache-common.c:sdr_cache_create_and_load(),
which is called by run_cmd_args(), which in turn called by
_ipmi_sensors(). You can find _ipmi_sensors as callback in main
function. All of them are in ipmi-sensors/ipmi-sensors.c, in the
trunk(revision 8603).


>
> Best regards
> Thanh
>
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Thanks,
Kaiwang